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asm3p2863a low power peak emi reducing solution ?2010 scillc. all rights reserved. publication order number: ja nuary 2010 C rev. 1 asm3p2863 /d features generates an emi optimized clock signal at the output. integrated loop filter components. operates with a 3.3v / 2.5v supply. operating current less than 4ma. low power cmos design. input frequency : 12mhz generates a 1x low emi spread spectrum cl ock of the input frequency. frequency deviation: 0.4%(typ) @ 12mhz input frequency available in 6 - pin tsot - 23, 8 - pin soic and 8 - pin tssop packages. product description the asm3p2863a is a versatile spread spectrum frequency modulator designed specifical ly for a wide range of clock frequencies. the asm3p2863a reduces electromagnetic interference (emi) at the clock source, allowing system wide reduction of emi of all clock dependent signals. the asm3p2863a allows significant system cost savings by reduci ng the number of circuit board layers , ferrite beads and shielding that are traditionally required to pass emi regulations. the asm3p2863a uses the most efficient and optimized modulation profile approved by the fcc and is implemented by using a proprietary all digital method. the asm3p2863a modulates the output of a single pll in order to spread the bandwidth of a synthesized clock, and more importantly, decreases the peak amplitudes of its harmonics. this results in significantly lower system emi compar ed to the typical narrow band signal produced by oscillators and most frequency generators. lowering emi by increasing a signal?s bandwidth is called ?spread spectrum clock generation . ? applications the asm3p2863a is targeted towards all portable devices with very low power requirements like mp3 players, notebooks and digital still cameras. key specifications description specification supply voltages v dd = 2.5v / 3.3v cycle - to - cycle jitter 200 ps ( typ) output duty cycle 45/55% (worst case) modulation rate equation f in /256 frequency deviation 0.4 % (typ) @ 12mhz block diagram vss modout xout refout xin / clkin frequency divider feedback divider modulation phase detector loop filter vco output divider pll vdd crystal oscillator
asm3p2863a rev. 1 | page 2 of 11 | www.onsemi.com xin / clkin vdd refout modout xout 1 2 3 4 5 6 asm3p2863a vss pin configuration (6 - pin tsot - 23 package) pin description pin# pin name type description 1 refout o buffered ou tput of the input frequency. 2 xout o crystal connection. if using an external reference, this pin must be left unconnected. 3 xin / clkin i crystal connection or external reference frequency input. this pin has dual functions. it can be connected either to an external crystal or an external reference clock. 4 vdd p power supply for the entire chip . 5 modout o spread spectrum clock output. 6 vss p ground connection.
asm3p2863a rev. 1 | page 3 of 11 | www.onsemi.com nc vss modout xin / clkin xout 1 2 3 4 5 6 7 8 asm3p2863a refout nc vdd pin configuration (8 - pin soic and tssop packages) pin description pin# pin name type description 1 xin / clkin i crystal connection or external reference frequency input. this pin has dual functions. it can be connected either to an external crystal or an external reference clock. 2 xout o crystal connection. if using an ex ternal reference, this pin must be left unconnected. 3 refout o buffered output of the input frequency. 4 nc - no connect. 5 vss p ground connection. 6 modout o spread spectrum clock output. 7 nc - no connect. 8 vdd p power supply for the entire chip . modulation profile specifications description specification input frequency 12mhz modulation equation f in /256 frequency deviation 0.4% ( typ ) @ 12mhz
asm3p2863a rev. 1 | page 4 of 11 | www.onsemi.com absolute maximum ratings symbol parameter rating unit vdd, v in voltage on any in put pin with respect to ground - 0.5 to +4.6 v t stg storage temperature - 65 to +125 c t s max. soldering temperature (10 sec) 260 c t j junction temperature 150 c t dv static discharge voltage (as per jedec std22 - a114 - b) 2 kv note: these are stress ra tings only and are not implied for functional use. exposure to absolute maximum ratings for prolonged periods of time may aff ect device reliability. dc electrical characteristics for 2.5v supply (test condition: all parameters are measured at room temperature (+25c) unless otherwise stated . ) symbol parameter min typ max unit v il input low voltage vss - 0.3 0.8 v v ih input high voltage 2.0 v dd + 0.3 v i il input low current - 35 a i ih input high current 35 a i xol xout output low curr ent (@ 0.5v, v dd = 2.5v) 3 ma i xoh xout output high current (@ 1.8v, v dd = 2.5v) 3 ma v ol output low voltage (v dd = 2.5v, i ol = 8 ma) 0.6 v v oh output high voltage (v dd = 2.5v, i oh = 8 ma) 1.8 v i dd static supply current 1 0.8 ma i cc dynam ic supply current (2.5v, 12mhz and no load) 3 ma v dd operating voltage 2.375 2.5 2.625 v t on power - up time (first locked cycle after power - up) 5 ms z out output impedance 50 ? n ote: 1. xin / clkin pin is pulled low . ac electrical characteristics for 2.5v supply symbol parameter min typ max unit clkin input frequency 12 mhz modout output frequency 12 mhz f d frequency deviation 0.4 % t lh 1 output rise time (measured fro m 0.7v to 1.7v) 0.5 1.5 1.7 ns t hl 1 output fall time (measured from 1.7v to 0.7v) 0.5 1.0 1.2 ns t jc jitter (cycle - to - cycle) 200 300 ps t d output duty cycle 45 50 55 % n ote: 1. t lh and t hl are measured into a capacitive load of 15pf .
asm3p2863a rev. 1 | page 5 of 11 | www.onsemi.com dc electrical character istics for 3.3v supply (test condition: all parameters are measured at room temperature (+ 25c) unless otherwise stated . ) symbol parameter min typ max unit v il input low voltage vss - 0.3 0.8 v v ih input high voltage 2.0 vdd + 0.3 v i il input low curr ent - 35 a i ih input high current 35 a i xol xout output low current (@ 0.4v, v dd = 3.3v) 3 ma i xoh xout output high current (@ 2.5v, v dd = 3.3v) 3 ma v ol output low voltage (v dd = 3.3v, i ol = 8 ma) 0.4 v v oh output high voltage (v dd = 3.3v, i oh = 8 ma) 2.5 v i dd static supply current 1 1 ma i cc dynamic supply current (3.3v, 12mhz and no load) 3.5 ma v dd operating voltage 3.0 3.3 3.6 v t on power - up time (first locked cycle after power - up) 5 ms z out output impedance 45 ? note: 1. xin / clkin pin is pulled low . ac electrical characteristics for 3.3v supply symbol parameter min typ max unit clkin input frequency 12 mhz modout output frequency 12 mhz f d frequency deviation 0.4 % t lh 1 output rise time (measured fr om 0.8 to 2.0v) 0.5 1.4 1.6 ns t hl 1 output fall time (measured at 2.0v to 0.8v) 0.4 1.0 1.2 ns t jc jitter (cycle - to - cycle) 200 300 ps t d output duty cycle 45 50 55 % note: 1. t lh and t hl are measured into a capacitive load of 15pf .
asm3p2863a rev. 1 | page 6 of 11 | www.onsemi.com crystal specifications fu ndamental at cut parallel resonant crystal nominal frequency 12mhz frequency tolerance 50ppm or better at 25c operating temperature range - 25c to +85c storage temperature - 40c to +85c load capacitance (c p ) 18pf shunt capacitance 7pf maximum e sr 25 note: c l is load capacitance and rx is used to prevent oscillations at overtone frequency of the fundamental frequency. t ypical crystal interface circuit c l = 2*(c p C c s ), where c p = load c apacitance of c rystal f rom crystal vendor datasheet. c s = stray c apacitance due to c in, pcb, trace , etc. c l rx c l crystal r xin xout
asm3p2863a rev. 1 | page 7 of 11 | www.onsemi.com package information 6 - pin tsot - 23 package symbol dimensio ns inches millimeters min max min max a 0.04 .. 1.00 a1 0.00 0.004 0.00 0.10 a2 0.033 0.036 0.84 0.90 b 0.012 0.02 0.30 0.50 h 0.005 bsc 0.127 bsc d 0.114 bsc 2.90 bsc b 0.06 bsc 1.60 bsc e 0.0374 bsc 0.950 bsc c 0.11 bsc 2.80 bsc l 0.011 8 0.02 0.30 0.50 0 4 0 4
asm3p2863a rev. 1 | page 8 of 11 | www.onsemi.com 8 - pin soic package symbol dimensions inches millimeters min max min max a1 0.004 0.010 0.10 0.25 a 0.053 0.069 1.35 1.75 a2 0.049 0.059 1.25 1.50 b 0.012 0.020 0.31 0.51 c 0.007 0.010 0.18 0.25 d 0.193 bsc 4.90 bsc e 0.1 54 bsc 3.91 bsc e 0.050 bsc 1.27 bsc h 0.236 bsc 6.00 bsc l 0.016 0.050 0.41 1.27 0 8 0 8 d e h d a1 a2 a l c b e
asm3p2863a rev. 1 | page 9 of 11 | www.onsemi.com 8 - pin tssop package symbol dimensions inches millimeters min max min max a 0.043 .. 1.10 a1 0.002 0.006 0.05 0.15 a2 0. 033 0.037 0.85 0.95 b 0.008 0.012 0.19 0.30 c 0.004 0.008 0.09 0.20 d 0.114 0.122 2.90 3.10 e 0.169 0.177 4.30 4.50 e 0.026 bsc 0.65 bsc h 0.252 bsc 6.40 bsc l 0.020 0.028 0.50 0.70 0 8 0 8 e h a a1 a2 d b c l e
asm3p2863a rev. 1 | page 10 of 11 | www.onsemi.com ordering information part number marking package t ype temperature asm3p2863af - 06or v4ll 6 - pin tsot - 23, tape & reel, pb free commercial asm3p2863af - 08tt 3p2863af 8 - pin tssop, tube, pb free commercial asm3p2863af - 08tr 3p2863af 8 - pin tssop, tape & reel, pb free commercial asm3p2863af - 08st 3p2863af 8 - pin soic, tube, pb free commercial asm3p2863af - 08sr 3p2863af 8 - pin soic, tape & reel, pb free commercial asm3p2863ag - 06or v3ll 6 - pin tsot - 23, tape & reel, green commercial asm3p2863ag - 08tt 3p2863ag 8 - pin tssop, tube, green commercial asm3p2863ag - 08tr 3p286 3ag 8 - pin tssop, tape & reel, green commercial asm3p2863ag - 08st 3p2863ag 8 - pin soic, tube, green commercial asm3p2863ag - 08sr 3p2863ag 8 - pin soic, tape & reel, green commercial device ordering information a s m 3 p 2 8 6 3 a f - 0 8 t r licensed under u s patent # 5,488,627 and # 5,631,921 . o = tsot23 u = msop j=tsot26 s = soic e = tqfp t = tssop l = lqfp a = ssop u = msop v = tvsop p = pdip b = bga d = qsop q = qfn x = sc - 70 device pin count x= automotive i= industrial p or n/c = commercial ( - 40c to +125c) ( - 40c to +85c) (0c to +70c) 1 = reserved 6 = power management 2 = non pll based 7 = power management 3 = emi reduction 8 = power manage ment 4 = ddr support products 9 = hi performance 5 = std zero delay buffer 0 = reserved o n semiconductor mixed sig nal product part number f = lead free and rohs compliant part g = green package, lead free, and rohs r = tape & reel, t = tube or tray
asm3p2863a note: th is product utilizes us patent # 6,646,463 impedance emulator patent issued to pulsecore semiconductor, dated 11 - 11 - 2003 . on semiconductor and are registered trademarks of semiconductor components industries, llc (s cillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitabili ty of its products for any particular purpose, nor does scillc assume any liabili ty arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. typical parameters which may be provided in scil including typicals must be publication ordering information literature fulf illment: literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone: 303 - 675 - 2175 or 800 - 344 - 3860 toll free usa/canada fax: 303 - 675 - 2176 or 800 - 344 - 3867 toll free usa/canada email: orderlit@onsemi.com n. american te chnical support : 800 - 282 - 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 - 3 - 5773 - 3850 on semiconductor website: www.onsemi.com order literature: http://www.onsemi.com /orderlit for additional information, please contact your local sales representative

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